Ruby | Float Class

Last Updated : 11 Jul, 2025

In Ruby, Float class is a subclass of Numeric class. The objects of the Float class represents real numbers using the native architecture's double- precision floating-point representation.

Public Instance Methods

Arithmetic Operations: This method perform various arithmetic operations on float.

Addition: It returns the result of the sum of float and numeric value in floating-point number.
```
float + numeric
```
Subtraction: It returns the result of difference of float and numeric value in floating-point number.
```
float - numeric
```
Multiplication: It returns the result of product of float and numeric value in floating-point number.
```
float * numeric
```
Division: It returns the result of division of float and numeric value in floating-point number.
```
float / numeric
```
Modulo: It returns the result of the modulo of float and numeric value in floating-point number.
```
float % numeric
```
Exponent: It returns the result of power of float and numeric value in floating-point number.
```
float ** numeric
```
Unary minus: It returns floating-point number.
```
float -@
```

Example:

Ruby

# Ruby program to illustrate 
# Arithmetic operation

a = 2.1
b = 2

# Addition
c = a + b    

puts "addition #{c}"

# Subtraction
d = a - b    

puts "subtraction #{d}"

# Multiplication
e = a * b   

puts "multiplication #{e}"

# Division
f = a / b   

puts "division #{f}"

# Modulo
g = a % b   

puts "modulo  #{g}"

# Exponent
h = a ** b  

puts "exponent #{h}"

# Unary minus
i= -a       

puts "unary minus #{i}"

Output:

addition 4.1
subtraction 0.1
multiplication 4.2
division 1.05
modulo  0.1
exponent 4.41
unary minus -2.1

<=> : This method returns -1, 0, or +1 depends upon float. If float is less then numeric value then it will return -1, if float is equal to numeric value, then it will returns 0, or if float is greater then numeric value, then it will return +1.
```
float <=> numeric --> 1, 0, +1 
```
Example:
Ruby
# Ruby program to illustrate # <=> Method puts 2.1 <=> 4 puts 2.0 <=> 2 puts 4.6 <=> 2
Output:
```
-1
0
1
```

== : This method returns true if the obj is equal to float otherwise it returns false.

float == obj --> true or false

Example:

Ruby

# Ruby program to illustrate 
# == Method

puts 3.8 == 4        
puts 3.8 == 3.8

Output:

false
true

abs : This method return absolute value of float.

float.abs --> numeric

Example:

Ruby

# Ruby program to illustrate 
# abs Method

puts (-54.56).abs    
puts (-65.04).abs

Output:

54.56
65.04

ceil : This method returns the smallest Integer greater than or equal to float. The return type of this method is int.

float.ceil --> int

Example:

Ruby

# Ruby program to illustrate 
# ceil Method

puts (4.1).ceil      
puts (4.0).ceil      
puts (-4.1).ceil

Output:

5
4
-4

divmod : This method will return an array that contains the quotient and modulus obtained by dividing num by numeric.

float.divmod(numeric) --> array

Example:

Ruby

# Ruby program to illustrate 
# divmod Method

p (45.0.divmod 5)   
p (98.0.divmod 5)

Output:

 
[9, 0.0]
[19, 3.0]

eql? : This method check if the obj is Float and contains the same value as in float. If they contains same value then it will return true, otherwise return false. The return type of this method is boolean.
```
float.eql?(obj) --> true or false
```
Example:
Ruby
# Ruby program to illustrate # eql? Method puts 4.2.eql?(2) puts 1.2.eql?(1.2)
Output:
```
false
true
```
finite? : This method check if the float is a valid IEEE floating-point number. If float is valid IEEE floating-point number then it will return true otherwise it will return false.
```
float.finite? --> true or false
```
Example:
Ruby
# Ruby program to illustrate # finite? Method puts (45.0).finite? puts (45.0/0.0).finite?
Output:
```
true
false
```

floor : This method returns largest integer less than or equal to float.

float.floor --> int

Example:

Ruby

# Ruby program to illustrate 
# floor Method

puts 2.2. floor          
puts (-4.6).floor

Output:

2
-5

infinite? : This method returns nil, -1, or +1 it depends upon float. If float is finite, then it return nil, if float is -infinite, then it return -1, or if float is +infinite then it return +1.

float.infinite? --> nil, -1, +1

Example:

Ruby

# Ruby program to illustrate 
# infinite? Method

puts (1.1).infinite?            
puts (-1.1/0.0).infinite?      
puts (+1.1/0.0).infinite?

Output:

nil
-1
1

modulo: This method is similar to Float#% method.

float.modulo(numeric) --> numeric

Example:

Ruby

# Ruby program to illustrate 
# modulo Method

puts 32.45.modulo(20)

Output:

12.450000000000003

nan? : This method return true if float is an invalid IEEE floating-point number otherwise it return false. The return type of this method is boolean.

float.nan? --> true or false

Example:

Ruby

# Ruby program to illustrate 
# nan? Method

puts (-2.2). nan?           
puts (0.0/0.0). nan?

Output:

false
true

round: This method rounds off float to the nearest integer value. The return type of this method is int.

float..round(digits=0) --> numeric

Example:

Ruby

# Ruby program to illustrate 
# round Method

puts 6.7.round      
puts (-8.9).round

Output:

7
-9

to_f : This method return float.
```
float.to_f --> float
```
to_i : This method return float truncate to the integer. The return type of this method is int.
```
float.to_i --> int
```
Example:
Ruby
# Ruby program to illustrate # to_i Method puts 5.6.to_i
Output:
```
5
```
to_int : This method is similar to Float#to_i.
```
float.to_int --> int
```
to_s: This method returns a string that contains a representation of self, as well as a fixed or exponential form of numbering. The call may return NaN, infinity and -infinity.
```
float.to_s --> string 
```
truncate : This method is equal to Float#to_i method. The return type of this method is int.
```
float.truncate 
```

zero? : This method return true if float is 0.0 otherwise return false. The return type of this method is boolean.

float.zero? --> true or false

Example:

Ruby

# Ruby program to illustrate 
# zero? Method

puts (0.0).zero?   
puts (1.4).zero?

Output:

true
false

Constants

Constants	Description
DIG	It holds minimum number of significant decimal digits in a double-precision floating point and it defaults to 15.
EPSILON	It holds difference between 1 and the smallest double-precision floating point number greater than 1 and defaults to 2.2204460492503131e-16.
MANT_DIG	It holds the number of mantissa digits of base RADIX. Defaults to 53.
MAX	It holds largest possible integer in a double-precision floating point number and it defaults to 1.7976931348623157e+308.
MAX_10_EXP	It represent the largest positive exponent in a double-precision floating point where 10 raised to this power minus 1. Defaults to 308.
MAX_EXP	It is the largest possible exponent value in a double-precision floating point which defaults to 1024.
MIN	It is the smallest positive normalized number in a double-precision floating point. Defaults to 2.2250738585072014e-308.
MIN_10_EXP	It is the smallest negative exponent in a double-precision floating point where 10 raised to this power minus 1. Defaults to -307.
MIN_EXP	It is the smallest possible exponent value in a double-precision floating point. Defaults to -1021
RADIX	The radix of floating-point representations or in other words, it is a base of floating-point numbers. Defaults to 2 on most systems, which would represent a base-10 decimal
ROUND	It represents the rounding mode for floating-point operations. The values includes are: -1: if the mode is indeterminate 0: if rounding towards zero 1: if the rounding is nearest to representable value 2: if rounding is towards +infinite 3: if rounding is towards +infinite
NaN	It is an expression representing a value which is "not a number".
INFINITY	It is an expression representing positive infinity.

Reference:

https://ruby-doc.org/core-2.4.0/Float.html

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